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package internal
import (
"encoding/json"
"fmt"
"io"
"log"
"os"
"path/filepath"
"strings"
"time"
)
type checkState struct {
Status nagiosCode
PrevStatus nagiosCode
Epoch int64 `json:"Epoch,omitempty"`
output string
}
func (cs checkState) changed() bool {
return cs.Status != cs.PrevStatus
}
type state struct {
stateFile string
checks map[string]checkState
staleEpoch int64
}
func newState(conf config) (state, error) {
s := state{
stateFile: fmt.Sprintf("%s/state.json", conf.StateDir),
checks: make(map[string]checkState),
staleEpoch: time.Now().Unix() - int64(conf.StaleThreshold),
}
if _, err := os.Stat(s.stateFile); err != nil {
// OK, may be first run with no state yet.
return s, nil
}
file, err := os.Open(s.stateFile)
if err != nil {
return s, err
}
defer file.Close()
bytes, err := io.ReadAll(file)
if err != nil {
return s, err
}
if err := json.Unmarshal(bytes, &s.checks); err != nil {
return s, err
}
var obsolete []string
for name := range s.checks {
if _, ok := conf.Checks[name]; !ok {
obsolete = append(obsolete, name)
}
}
for _, name := range obsolete {
delete(s.checks, name)
log.Printf("State of %s is obsolete (removed)", name)
}
return s, nil
}
func (s state) update(result checkResult) {
prevStatus := nagiosUnknown
prevState, ok := s.checks[result.name]
if ok {
prevStatus = prevState.Status
}
cs := checkState{result.status, prevStatus, result.epoch, result.output}
s.checks[result.name] = cs
log.Println(result.name, cs)
}
// To be used to merge the state of another server running Gogios
func (s state) merge(other state) error {
for name, cs := range other.checks {
if _, ok := s.checks[name]; ok {
return fmt.Errorf("can't merge state due to duplicate check name '%s'", name)
}
s.checks[name] = cs
}
return nil
}
func (s state) persist() error {
stateDir := filepath.Dir(s.stateFile)
if _, err := os.Stat(stateDir); os.IsNotExist(err) {
if err := os.MkdirAll(stateDir, 0755); err != nil {
return err
}
}
jsonData, err := json.Marshal(s.checks)
if err != nil {
return err
}
return os.WriteFile(s.stateFile, jsonData, os.ModePerm)
}
func (s state) report(renotify, force bool) (string, string, bool) {
var sb strings.Builder
sb.WriteString("This is the recent Gogios report!\n\n")
sb.WriteString("# Alerts with status changed:\n\n")
changed := s.reportChanged(&sb)
if !changed {
sb.WriteString("There were no status changes...\n\n")
}
sb.WriteString("# Unhandled alerts:\n\n")
numCriticals, numWarnings, numUnknown, numOK := s.reportUnhandled(&sb)
hasUnhandled := (numCriticals + numWarnings + numUnknown) > 0
if !hasUnhandled {
sb.WriteString("There are no unhandled alerts...\n\n")
}
sb.WriteString("# Stale alerts:\n\n")
numStale := s.reportStaleAlerts(&sb)
if numStale == 0 {
sb.WriteString("There are no stale alerts...\n\n")
}
sb.WriteString("Have a nice day!\n")
subject := fmt.Sprintf("GOGIOS Report [C:%d W:%d U:%d S:%d OK:%d]",
numCriticals, numWarnings, numUnknown, numStale, numOK)
doNotify := force || (changed || (renotify && hasUnhandled))
return subject, sb.String(), doNotify
}
func (s state) reportChanged(sb *strings.Builder) (changed bool) {
if 0 < s.reportBy(sb, true, false, func(cs checkState) bool {
return cs.Status == nagiosCritical && cs.changed()
}) {
changed = true
}
if 0 < s.reportBy(sb, true, false, func(cs checkState) bool {
return cs.Status == nagiosWarning && cs.changed()
}) {
changed = true
}
if 0 < s.reportBy(sb, true, false, func(cs checkState) bool {
return cs.Status == nagiosUnknown && cs.changed()
}) {
changed = true
}
if 0 < s.reportBy(sb, true, false, func(cs checkState) bool {
return cs.Status == nagiosOk && cs.changed()
}) {
changed = true
}
return
}
func (s state) reportUnhandled(sb *strings.Builder) (numCriticals, numWarnings,
numUnknown, numOK int) {
numCriticals = s.reportBy(sb, false, false, func(cs checkState) bool {
return cs.Status == nagiosCritical
})
numWarnings = s.reportBy(sb, false, false, func(cs checkState) bool {
return cs.Status == nagiosWarning
})
numUnknown = s.reportBy(sb, false, false, func(cs checkState) bool {
return cs.Status == nagiosUnknown
})
numOK = s.countBy(func(cs checkState) bool {
return cs.Status == nagiosOk
})
return
}
func (s state) reportStaleAlerts(sb *strings.Builder) int {
return s.reportBy(sb, false, true, func(cs checkState) bool {
return cs.Epoch < s.staleEpoch
})
}
func (s state) reportBy(sb *strings.Builder, showStatusChange, isStaleReport bool,
filter func(cs checkState) bool) (count int) {
for name, cs := range s.checks {
if !filter(cs) {
continue
}
if !isStaleReport && cs.Epoch < s.staleEpoch {
continue // skip stale checks in non-stale report
}
count++
if showStatusChange && cs.changed() {
sb.WriteString(nagiosCode(cs.PrevStatus).Str())
sb.WriteString("->")
}
sb.WriteString(nagiosCode(cs.Status).Str())
sb.WriteString(": ")
sb.WriteString(name)
sb.WriteString(": ")
sb.WriteString(cs.output)
sb.WriteString("\n")
}
if count > 0 {
sb.WriteString("\n")
}
return
}
func (s state) countBy(filter func(cs checkState) bool) (count int) {
for _, cs := range s.checks {
if filter(cs) {
count++
}
}
return
}
|
